Safety device for perforating machines



- July 1, 1930. w. F. LAUTENSCHLAGER' 1,769,699

SAFETY DEVICE FOR PERFORATING MACHINES Filed Jan. 17, 1924 2 Sheets-Sheet 1 LDM QA-MOMQv-SQLLQW wwyuww July 1, 1930. w. F LAUTENSCHLAGER 1,769,699

SAFETY DEVICE FOR PERFORATING MACHINES Filed Jan. 17, 1924 2 Sheets-Sheet 2 Patented July 1, 193a stares (Wm-"K Immunei WILLIAM F. LAUTENSCHLAGER, OF CINCINNATI, OHIO, AS SIGNOR TO THE PEERLESS MACHINERY GQMPANY, OF BOSTON, MA

CEUSETTS SSACHUSETTS, A CORIEORATION OF MASSA- SAFETY DEVICE FOR PERFORATING MACHINES Application filed January 17, 1924. Serial No. 686,819.

This invention relates to a safety device for perforating machines of the general type shown in United States Letters Patent, No. 1,434,060, issued to me October 31, 1922.

The operation of machines of this character is generally controlled by means 'of a foot treadle, the depression of which by the foot of the operator is arranged to thrown. in a clutch and start the machine which continues in operation so long as the treadle is depressed. A momentary depression of the treadle, however, is suflicient to cause the machine to perform one complete perforating operation and generally thesemachines are operated in' this manner rather than continuously. Whenever, therefore, the foot treadle is moved suificiently to release the clutch, whether "that movement is accidental or intentional, the die-carrying plunger is op-- danger of injury if the operator is careful 5 since in presenting the work to the machine erated to perforate. Y e

In the ordinary and usual operation of machines of this class there is very little she is not, at any time, required to place her hands in jeopardy. The changing of the dies in the machine, however, necessitates the insertion of the hands between the plunger v and the work support, and if.,while the hands are in this position, the treadle is accidentally moved or depressed sufficiently to release the clutch, the plunger will descend and cut or crush the hands of the operator. It is,

. therefore, important and desirable to provide means for obviating such accidents because machines of this type are very powerful and rapid in their action, and the results from such accidents are apt to be very serious.

The main object of this invention is the provision of simple and .eflicient means applied to a perforating machine ofthe character described for preventing the machine 1 any.

' I frame of the machine open'at the front but from being started in-operation while changes are being made in the dies.

except when the machine is a positive in; operative state in which the depression of. p

plates 18 and winged nuts19the die 2Oprov1dthe treadle is entirelywithoutelfectn in a perforating machine of the character describediof means for normally enclosing the die-holding means to prevent'access thereto, said means, however, being movable to ex pose the die holding means to manipulation in which position the clutch is rendered inoperative so that the machine cannot be started until the enclosing means is returned to normal position. i

In the drawings illustratingone form of my invention, Figure lis aside elevation of a perforating machinemade under the pat-. ent hereinbeforereferred to andhaving ap plied thereto a safety device constructed and designed to operate in accordance with my invention; Fig. 2 is an elevation of the lower. portion of the other side of the machine, the safety device being shownin a normal closed position in full lines and in an open position in broken lines; Fig. 3 is a side elevation of the clutch mechanism with treadle operated releasing means as viewed from within-the machine; Fig. 4 is a bottom plan View of the clutch on line i-4, in Figure 1, looking up-v wardly, the clutch being out; and Fig. 5 is a similar view with the clutch thrown in; and Fig. 6 is a longitudinal sectional'view of the dog and pin. p

v In the drawings illustrating one form of my inventiomapplied to a perforating machine of the characterdescribed in the patent to me hereinbefore referred to, there is shown the frame of that machine and such portions ofit as are necessary to properly illustrate the application of this invention. .For a more detailed description of the machine, its construction and mode of operation, the said patent may be referredfto, Referring; to Figure 1, designates the the wor lB filed on the end of'the mainor driving shift 27 which hub-block carries a clutchpin 28 adapted to be enga ed when in released position by a lug (not s own) on the inner face of the hub of the belt pulley. A spring 29 mounted under compression in a recess 30 inqthe hub block and bearing at its outer end ti'pon a. pin 31 set transversely in the clutchm serves to force it outwardly into operative 'tion. Upon the inner end of the elutemn 28 is fixed a cam-block 32, its inner end belng curved to partially surround and engage the shaft 27 to prevent its turning and its outer end having a bevelled cam surface 33. AJlocking pin 34 is mounted in bearings 35 M11636 secured to or integral with one side of the frame 10, and when in normal position its [rend is adapted to engage the cam sur- 83 and retract the clutch-pin from operative engagement with the belt pulley to perfifitthe atterto run idly. A collar 38 adapted topngage the bearing 35 may be secured to the mil-34 to limit its upward movement and ism-and collar 39 of larger diameter held in position by a screw 37 serves as an abutment for depressing the locking pin to releasethe clutc pin. For normally holdiifitthe locking pin in operative position a h foal spring 40 is mounted thereon abutat one end the bearing 36 and at its other endfthe collar 39.

Bivotally mounted on one end of ashaft 'izQproject-ln from the frame 10 is a lever 44 whic is pivotally connected at its upper end by a pin 45 to a strap 46 mounted eccentrically on the hub block 26 and held theieon by the overlapping head of a screw 47 threaded into the inner face of the hubhlock. ,The lever 44 has pivotally mounted on a sciew pin 49 on its inner face a dog 50 receive a pin 51 having a shoulder a reduced portion53 threaded at its entltp'receive a nut 54. The bore in the dog rear portion is contracted to fit the Weed portion 5370f the pin and a shoulder is therefore formed in the bore which fives as an abutment for a helical spring 56 irlrith'is mounted on the pin 51 and abuts at itaother end the shoulder 52. The spring bein .uiider compression forces the pin outwfidl and the limit of this outward move- I? ated by the nut 54 which may be magma h a reduced portion 53 to regulate t apt Ht tlB holds the nut 54 inadjusted posi- Emotion of the pin from the dogi50. A.

The dog 50 is held in a raised position by means of a spring 60 fastened at one end to a screw 61 set in the upper part of the lever 44 and at its other end to a screw 62 set in the dog 50. Two adjustable stops are provided for limiting the movement of the dog up and down, each consisting of a screw 63 threaded through a lug 64 on the lever 44 and held by a set-nut 65. A chain 67 fastened to the dog 50 may be connected to a foot-treadle or other means for starting the machine.

The machine is started whenever thedog through the operation of the foot treadle or other means is depressed sufficiently for the pin 51 by engagement with the collar 39 to pull the locking in downwardly out of engagement with t e cam 33. The spring 29 then forces out the clutch-pin 28 where it is en aged by the lug on the inner face of the be t pulley 25 and the main shaft is rotated. If the treadle is immediately released the locking pin is forced back by the spring 40 into normal position, but if not released, the rotation of the hub-block 26 through the eccentric strap throws the lever 44 outwardly withdrawing the pin from engagement with the collar 39 and the locking pin returns to normal position. In any event the locking pm returns to normal during, or at the end of the first half revolution of the hub-block and is in position to engage the cam and disconnect the clutch at the end of one revolution. The release of the treadle after the locking pin has returned to normal permits the do to return to normal the pin 51 being retracted in the do against the spring 56 topass the collar 39 y engagement with it. The stop screw 63 is so adjusted that the dog 50 can not at any time be depressed far enough so that the pin 51 will get under the collar 39 mounted on the locking pin and therefore upon the release of the treadle, the dog will at all times be raised to normal position by the spring 60.

In applyin my invention to the machine just describe means are provided for normally preventing access to the die-holding means, said means, however, being movable to expose the die-holding means to manipulation and one ,form of such means is shown consisting of a frame which. encircles and covers the die-holding means, that is, the end-plates 18 and nuts 19. The frame made up of two .arms 7 0 and 71 connected-at their forward ends by. ahand 72 and is. pivotally mounted on a shaft 73 set in the frame 10. In its normal position as shown in Figures 1 and 2, the frame covers the die-holding means and revents access thereto. In order to expose t e die-holding means the frame is pivotally moved intothc position shown in broken lines in said fi ures. For locking the frame in normal position, the arms 71 is provided with arearward extension 74 near the end of which ispivotally mounted on a screw 75 a locking arm or dog 76 having a III holds the dog in locked position. The end of the dog may be curved upwardly to form a finger-piece 82 whereby the operator may pull the dog downwardlytorelease the frame for forward movement. A hook 83 formed in the end of the extension 7 4 engages the pin 78 to limit the downward movement of the frame.

In order that the machine maybe rendered inoperative whenever the frame is moved away from normal position, any means maybe provided for renderingthe clutch inoperative and one such mcansis shown comprising aislide bar 85 adapted to be pushed under the lower end-ofthe locking pin 345to prevent its withdrawal from the camsblock to release the clutclrpin and start the machine. Theslide-bar is pivotally co n: nected'by a link 86 to an extension 8'? of the arm so that any movement of the frame to expose the die-holding means forces the slide-bar in under-the locking-pin. To pre vent the machine being started immediately upon thereturn of. the frame to normal position in case the operators foot happens inadvertently or carelessly to be on the treadle which might result in accident the end of the slide-bar maybe provided with a raised portion 90 which will prevent the slide-bar being withdrawn and the frame returned. to normal position until the operator takes the foot off the treadlev or releases all pressure thereon topermit the spring 40 to force the locking pininto its uppermost position as shown in Fig. 1, which is the only position in which the slide-bar may be withdrawn.

it will be apparent from the, foregoing that the operator is absolutely protected from danger when changing the dies and that any carelessness on her part with relation to the foot-treadle cannot start the machine until she has finished her work lnrelation to the dies and has returned the frame to 1ts normal position. I

' It is to be understood that the form of my invention herein shown and described is merely for purposesof illustration and'that' the invention may be exemplified by other constructions andmay be applied to machines of other. forms by changes apparent to one skilled in the art. i

. hat Iclai'mis: i

1'; A; safety -device for treadle-operatedperforating machines fliaving, in combina-' means being movableto expose said die-holdmeans to manipulation, and means for rendering-the perforating machine inoperagtive whenever said first-mentioned means is 'moved out of normal position and until all pressure has been removed from said treadle and said first-mentioned means returned to normal position.

f 2. A safety device for treadle-operated perforating machine having, in combination, means for normally preventing access to thedie-holdingmeans while permitting free handling of the work in the machine, said means being movable to expose said die-holding means to manipulation, means operated by the movement of said preventing means out of normal position for rendering saidper-fo rating machine inoperative and means for locking said preventing means against a 1'65 turn to normal position so long as there is any pressure on said treadle. 3.. A safety device for treadle-operated perforating machineshaving, in combination, a guard for normally preventing access to the die-holding means while permitting free hans dling of, the work in the machine, said guard being movable to expose said die-holding means to manipulation, and means operated by said guard whenever moved out of normal position for locking said treadle. against movement to start the machine; said means being arranged tolock said guard against a return to normal position so long as the said treadle is subject to any pressure. V l

4. A safety device for treadle-operatedper: forating machines "having, in combination, a;- pivotally mounted guard, for normally preventing access to the die-holding means while permitting free handling of the work in the machine, said guard being pivotallymovable to expose said die-holding means to 'manipu lation, a member connected to said guard and adapted,when said guard is moved out of normal position, to be thrown into a position to lock said treadle against operative movement to startthe machine; said Inemberbeing so constructed that it cannot be retracted from looking position so long as there isany pressure'on said treadle. I 1 A safety device for perforating ma? chines having, in combination, .a guard for normally preventing access to-the die-holding means While permitting free handling of the, work in the machineandso constructed as to permit thework, to be manually positioned for perforating, said guard beingfmovable. to expose said die-holding means to manipulation; and means operated by the movement of said guard out of normal positionfor rendering said perforatingmachineinoperative so longas saidguard remains out of normal po sition, v r

.6. In aperforating machineythej combination of a reciprocable plunger, a perforating die, means for holding said perforating dieupon said ,plunger, a clutch for connecting the machine to a 'source of power, 7 a locking pin, atreadle for pulling out said locking pin to release said clutch to start the machine in operation, a guard normally preventing accase to the die holdin means while permiton: free handling of t e work in the machine an a member connected to said guard and adapted to be moved under the end of said locking pin to prevent releasing of the clutch whenever said guard is moved out of normal position to permit access to the die'holding m a T. In a perforating machine, the combinatien of a reciprocable plunger, a perforating means for holding said perforating die I! said plunger, a clutch for connecting 5" mathineto a source of power, a locking pin, a treadle for pulling out said locking pin Wuhan said clutch to start the machine in 'qpum tion, a guard normally preventing aca 065 M the die holding means and a member a d to said guard and adapted to be under the end of said lockingpin to Mt releasing of the clutch whenever said Mia moved out of normal position to per mm to the die holding means; said a being providedwith an abutment on its and to revent its withdrawal from under the and 0 said locking pin so long as there is any; ressure on said treadle.

BL aperforating machine, thecombinatiouof a reciprocable plunger, a perforating die, means for holding said perforating die said plunger, a'clutoh for connecting machine to a source of power, a locking i treadle for pulling out said locking pin said clutch to start the machine in operation, a guard normally preventing acg ctbto the die holding means while permitfree handling of the work in the machine up a slide connected to said guard and waisted to be moved under the end of said 1 ng pin to prevent releasing of the clutch whenever said guard is moved out of normal ppsition to permit access to the die holding means w "NIn a perforating machine, the combination of a reciprocableplunger, a perforating queens for holding said perforating die pgu'slid plunger, a clutch for connecting e to a sourceof power, a'locking Wpiava tmddle for pulling out said locking pin saidol'uflch to start the machine in normally preventing acte said gaard and adapted to be moved the e d ofsaid locking pin to prevent moved butofjnormalposition to emit access W fine die holding means; sai slide being provided with an abutment on its end to prew; m litgj 'flithdrtwfll from underthe end of y ,pinso long as there is any presare 7 g e treadle. emanates device for perforating mamfnee'havipg, in combination, a guard for I on preventing access to the die-holdthe die holding means and a slide eoning means while permitting free handling of the work in the machine, said guard being movable to expose said die-holding means to mani ulation, and means whereby the perforatmg machine is rendered inoperative 7" whenever said guard is in a position exposing said die-holding means.

11. A safety device for perforating machines having, in combinatiommeans for normally preventing access to the die-holding means while permitting free handling of the work in the machine, said means being movable to expose said die-holding means to manipulation and means for rendering the perforating machine inoperative whenever said 3 first mentioned means is moved out of normal position.

12; A safety device for perforating machines having, in combination, a pivotally movable yoke guard for normally preventing access to the die holding means while ermitting free handling of the work in t e machine, said guard being movable to expose said die holding means to manipulation and a movable slide linked to one end of said on guard for rendering the perforating machine inoperative whenever and so long as said guard is out of normal position.

13. In a perforating machine, the combination with a die, die holding means and a 5 treadle operated clutch forconnecting said machine with a suitable source of power, of a guard for normally preventing access to said die-holding means while permitting free handling of the work in the machine, said 166 uard being movable to expose said die-holding means to manipulation and a slide mem ber operated by said guard for rendering the clutch inoperative to start the machine whenever said guard is moved out of normal posis tion, said slide member being provided with an abutment to prevent said guard being returned to normal position so long as there is any pressure upon the treadle.

14. The combination with a perforating machine provided with a clutch for connecting said machine to a source of power, a locking pin for normally holding said clutch inoperative and a treadle for withdrawing said locking pin to release said clutch to start the machine, of a safety device comprising a guard for normally preventin access to the die holding means, said guard eing movable to expose said die holding means to manipulation, and a member connected to said guard no and adapted, when said guard is moved to expose said die holding means. to be thrown transversely across the outer end of said looking pin to prevent said pin being withdrawn to release saidclutch.

15. The combination with a perforating machine provided with a clutch for connecting said machine to a source of power, a lock- 1 ing pin for normally holding said clutch in operative and a treadle for withdrawing said locking pin to release said clutch to start the machine, of a safety device comprising a guard for normally preventing access to the die holding means, while permitting free handling of the work in the machine, said guard being movable to expose said die holding means to manipulation, and a member connected to said guard and adapted, when said guard is moved to expose said die holding means, to be thrown transversely across the outer end of said locking pin to prevent said pin being withdrawn to release said clutch.

16. The combination with a perforating machine provided with a clutch for connecting said machine to a source of power, a locking pin for normally holding said clutch inoperative and a treadle for withdrawing said locking pin to release said clutch to start the machine, of a safety device comprising a guard for normally preventing access to the die holding means, while permitting free handling of the work in the machine, said guard being movable to expose said die hold- 5 ing means to manipulation, and a member connected to said guard and adapted, when said guard is moved to expose said die holding means, to be thrown transversely across the outer end of said locking pin to prevent said pin being withdrawn to release said clutch; said member being provided with an end abutment to prevent the guard being returned to normal position so long as there is any pressure on the treadle. In witness whereof, I hereunto set my hand this seventh day of January, 1924.

WILLIAM F. LAUTENSCHLAGER. 

